QVersionNumber: de-inline QList constructor calls and resize()

The QList<int> range ctor and other QList<int> methods have percolated
up near the top of the list of Clang -ftime-trace most expensive
template instantiations in PCH libQt6Gui.so builds:

**** Templates that took longest to instantiate:
  [...]
  5138 ms: QList<int>::QList<const int *, true> (256 times, avg 20 ms)
  4327 ms: QtPrivate::QCommonArrayOps<int>::appendIteratorRange<const int *> (256 times, avg 16 ms)

The code in 6.3 is already sufficiently different for this patch to
not be applicable there.

Task-number: QTBUG-97601
Change-Id: I4420c8c90e472ecfd679b414cc4334d2ab55cce3
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/corelib/tools/qversionnumber.cpp b/src/corelib/tools/qversionnumber.cpp
index 6494603a11..8002cc9d3f 100644
--- a/src/corelib/tools/qversionnumber.cpp
+++ b/src/corelib/tools/qversionnumber.cpp
@@ -481,6 +481,29 @@ QVersionNumber QVersionNumber::fromString(QAnyStringView string, qsizetype *suff
     return string.visit([=] (auto string) { return from_string(string, suffixIndex); });
 }
 
+void QVersionNumber::SegmentStorage::setListData(const QList<int> &seg)
+{
+    pointer_segments = new QList<int>(seg);
+}
+
+void QVersionNumber::SegmentStorage::setListData(QList<int> &&seg)
+{
+    pointer_segments = new QList<int>(std::move(seg));
+}
+
+void QVersionNumber::SegmentStorage::setListData(const int *first, const int *last)
+{
+    pointer_segments = new QList<int>(first, last);
+}
+
+void QVersionNumber::SegmentStorage::resize(qsizetype len)
+{
+    if (isUsingPointer())
+        pointer_segments->resize(len);
+    else
+        setInlineSize(len);
+}
+
 void QVersionNumber::SegmentStorage::setVector(int len, int maj, int min, int mic)
 {
     pointer_segments = new QList<int>;